When I worked at Los Alamos, the head of counterintelligence was a former CIA ops guy. He seemed warm and intelligent; just an all around good guy. In presentations, he explained that his job at the CIA was to exploit that appearance to ruin people's lives. He said his approach was to gain the trust of a mark, and then provide him with what ever was required to get him to betray things he loved. The presentations were effective, enlightening and spooky.
So, I agree: All spies are bastards.